ASTM D6650-01

This test method can be used for acceptance testing of commercial shipments but comparisons should be made with caution because information on estimates of between-laboratory precision is limited as noted in the precision and bias section of this test method.

5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, samples used for such comparative tests should be as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing, and randomly assigned in equal numbers to each laboratory. Other fabrics with established test values may also be used for these comparative tests. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results must be adjusted in consideration of the known bias.

This test method depends on the ability to accurately place a known mass/volume of liquid and number of particles on a surface, so that an accurate mass of liquid adsorbed, number of particles contributed by a wiping fabric, and the number of particles contributed by a known contaminant to the liquid may be determined.

This test method is useful to select fabrics with superior cleaning and drying properties that can minimize the costs for spill removal. It can also be used to research fabrics for improved spill removal and for production control.

It is beneficial to perform the dynamic wiping efficiency test in unison with the wet particle removal ability test. This allows for a more precise correlation of these variables.

1.1 This test method covers the determination of the dynamic wiping efficiency, wet particle removal ability and fabric particle contribution of nonwoven fabrics.

1.2 This test method applies to all nonwoven fabrics used in cleanrooms. For more information see Journal of the IEST.

For dynamic wiping efficiency in non-cleanrooms, refer to Test Method D 6702 Standard Test Method for Determining the Dynamic Wiping Efficiency of Nonwoven Fabrics Not Used in Cleanrooms.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.